Gerrit Pape <[EMAIL PROTECTED]> wrote: > On Sat, Jan 07, 2006 at 03:33:43PM -0800, Eric Wong wrote: > > fflush(NULL) seems to flush the stdin stream, as well as any open > > streams it can find, regardless of whether or not it's a writeable > > stream. According to the fflush manpage, this is wrong: > > > > If the stream argument is NULL, fflush() flushes all open > > output streams. > > > > You can see this behavior with the test program I've included below, and > > then test it again by commenting out the fflush(NULL) call in it to see > > the difference. > > Hi Eric, while I can see from the dietlibc sources that indeed the input > streams including stdin are fflushed, I currently cannot see the impact. > > Can you please show me how to use your test program to see a difference?
Just use it to read a text file from stdin. You'll note that there are
missing lines when compiled with dietlibc
> > #include <stdio.h>
> > #include <string.h>
> >
> > int main (void)
> > {
> > char buf[4096];
> > while (fgets(buf,4096,stdin)) {
> > /* this can also be fwrite/fprintf: */
> > write(1,buf,strlen(buf));
> >
> > /* you can comment this out to compare */
> > fflush(NULL);
> > }
> >
> > return 0;
> > }
> >
> > /* EOF */
>
--
Eric Wong
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